Old school tap and die sheet

Biker1mike

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Jan 11, 2022
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Was in the machine shed and saw these on the wall. It has been a long time. Now you machinist may have all this committed to memory and the young ones have it on their phones. But next to the old rotary wall phone are the sheets.

conversion.jpg
 
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NCL4701

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As many things change, it’s kind of nice to be reminded some things don’t. Still as valid as it ever was.
 

torch

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I have similar charts posted up on the wall beside the lathe and another beside the drill press.
 

William1

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Mine are attached to the lid of my tool box. I still refer to them a few times a year, mostly for fractional to decimal conversion.
 

GeoHorn

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Mine are in a book of tables laying atop my taps and dies…. ever since I bought my first set….in 1969.
 

lugbolt

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ZG127S-54
Oct 15, 2015
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phone dont work in the shop and yes I have tap/drill charts stapled to the wall near the drill index and drill press. Also have a drill index chart that gives actual sizes of each bit.
 

Yooper

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May 31, 2015
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Much respect for the old timers! Imagine taking a sheet of paper and pencil and looking up the trigonometry for doing a bolt circle without a calculator. Might have taken more than one sheet of paper for a lot of holes. Much easier to be a machinist today
 

TheOldHokie

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windyridgefarm.us
Much respect for the old timers! Imagine taking a sheet of paper and pencil and looking up the trigonometry for doing a bolt circle without a calculator. Might have taken more than one sheet of paper for a lot of holes. Much easier to be a machinist today
Easier and more accurate. On my DROs you enter number of holes, starting angle, and diameter. Then just hit next for the X-Y offset from current position to first/next hole.

I have multiple wall charts and Machinists Handbook for things like tap drill sizes but the cell phone is usually closer, much easier for old eyes to read, and faster...

Dan
 
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lugbolt

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ZG127S-54
Oct 15, 2015
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Shop is my getaway unless I'm working on customer's stuff then the phone is on. Any other time, no. Nothing worse than getting into "that zone" where your'e totally focused on what you're doing, stuff's falling together as planned,........and then the phone rings because the ol lady just wants to chit-chat with no other purpose. "can you go pick up some ex lax?" Or the guy down the road needs his truck jump started. Or the lady next door needs the plumbing addressed. That's happened. But it's legit-tub was plugged up with hair. Yeah I get the call, she says come on over. I walk in the side door she says follow me to the bathroom. Well, I had a different idea than her so it became awkward quickly. Bathtub was about to run over. Went back to the shop grabbed a piece of 3/32 4043 TIG rod, bent the tip of it and went back to her place and unplugged the pipe as requested. I even left her the rod so she could unplug it by herself the next time.

besides the older I get the more I realize that reading it in a book or a chart exercises my brain, which is a good thing. Well, it's a good thing until I get where I can't read it no more; and with my eyes, that's gonna be here sooner than expected.
 

BXHoosier

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Indiana
I still refer to my charts occasionally but I have most of the common sizes memorized. Tap drill size for inch taps can be found using this simple formula:
Tap dia - (1/pitch) =tap drill size.
Example for a 1/4”-20: 0.25”-(1/20)=0.200”.
The correct drill is a #7 which is 0.201”. That is the closest size to 0.200”.

Metric taps are easier.
Tap dia - pitch = tap drill.
Example: M8x1.25: 8mm-1.25mm=6.75mm
1”=25.4mm
1mm=0.03937”
 
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